When show producer Susan Breen told David Holmes, who co-wrote the music for the series, that she was a fan of Sinead O'Connor's music, he said: "I told Sinéad the script was not like anything else anyone has done on the subject, and it had Ruth Wilson, one of the finest actors in the world - on a different level. Sinéad said: 'I believe you. Give them 'The Magdalene Song'.""
The song had not been previously released and in it O'Connor sings of the pain of losing a child and calls on her own experience of being in a similar institution to that shown in the series from the age of 15.
The Magdeline Song was played over the closing credits of the series finale.
Sadly, O' Connor died before the series was aired.